The Big Conversation:
Gov. Rick Perry's departure from the presidential race on Thursday touched off the most tumultuous day yet of the 2012 election cycle.
In an abruptly announced morning news conference, Perry said he had decided that there was "no viable path forward" for him as a presidential candidate. "The journey leads me back to Texas, neither discouraged nor disenchanted," he said, "but instead rewarded highly by the experience, and resolute to remain in the arena and in the service of my country."
Perry, flanked by his wife and son, said he had decided to endorse Newt Gingrich ...